Heatmiser PRT-E User manual

Operating Instructions
Model : PRT-E / PRT-EN
Installer Note:
This thermostat is a combination model allowing you to choose
between “Floor Only” or “Air & Floor” temperature control.
Please see page 11 for more information.
This product should be installed by a qualified electrician.
Improper installation may result in injury, death or
property damage.

Contents Table
Contents 1
What is a programmable thermostat 2-4
Installation 5-6
Initial Setup Procedure 7-12
Symbols Explained 13
Button Layout 14
Temperature Display 15
Setting the Clock 15
Temperature Override 16
Frost Mode 16
Setting the Comfort Levels 17-18
Keylock 19
Viewing the Floor Temperature 19
Wiring
PRT-E-N Mode 0 Wiring Diagrams 20-21
PRT-E-N Mode 1 Wiring Diagrams 22-23
1

2
What is a programmable room thermostat ?
A programmable room thermostat is both a programmer and a
room thermostat. A programmer allows you to set On and "Off time
periods to suit your own lifestyle. A room thermostat works by
sensing the air temperature, switching on the heating when the air
temperature falls below the thermostat setting, and switching it off
once this set temperature has been reached.
So, a programmable room thermostat lets you choose what times
you want the heating to be on, and what temperature it should
reach while it is on. It will allow you to select different temperatures
in your home at different times of the day (and days of the week) to
meet your particular needs.
Turning a programmable room thermostat to a higher setting will not
make the room heat up any faster. How quickly the room heats up
depends on the design of the heating system, for example, the size
of the boiler and radiators.
Neither does the setting effect how quickly the room cools down.
Turning a programmable room thermostat to a lower setting will
result in the room being controlled at a lower temperature, and
saves energy.

The way to set and use your programmable room thermostat is to
find the lowest temperature settings that you are comfortable with
and the different times you have chosen and then leave it alone to
do its job.
The best way to do this is to set low temperatures first, say 18ºC,
and then turn them up by one degree each day until you are
comfortable with the temperatures. You wont have to adjust the
thermostat further. Any adjustment above these setting will waste
energy and cost you more money.
If your heating system is a boiler with radiators, there will usually be
only one programmable room thermostat to control the whole
house. But you can have different temperatures in individual rooms
by installing thermostatic radiator valves (TRVs) on individual
radiators. If you don't have TRVs, you should choose a temperature
that is reasonable for the whole house. If you do have TRVs, you
can choose a slightly higher setting to make sure that even the
coldest room is comfortable, then prevent any overheating in other
rooms by adjusting the TRVs.
The time on the programmer must be correct. Some types have to
be adjusted in spring and Autumn at the change between
Greenwich Mean Time and British Summer Time.
3

You may be able to temporarily adjust the heating programme, for
example “Override”, “Advance” or “Boost” These are explained in
the manufacturers instructions.
Programmable room thermostats need a free flow of air to sense
the temperature, so they must not be covered by curtains or blocked
by furniture. Nearby electric fires, televisions, wall or table lamps
may prevent the thermostat from working properly.
4

Installation Procedure
DO’s
1. Mount the thermostat at eye level.
2. Read the instructions fully so that you get the best from our
product.
3. Install the floor probe into a conduit so that it can be replaced if
necessary.
DON’Ts
1. Do not install near a direct heat source as this will effect the
workings of the thermostat.
2. Do not push hard on the LCD otherwise you will damage the
liquid crystal display.
Installation
The thermostat is designed to be flush mount, a back box of 35mm
should have been sunk in the wall prior to installation.
Step 1
Carefully separate the front half of the thermostat from the back
plate by placing a small flat head terminal driver in to the slots on
the bottom face of the thermostat.
5

Step 2
Carefully unplug the ribbon connector which is plugged in to the
front half of the thermostat.
Place the thermostat front half somewhere safe.
Terminate the thermostat as shown in the diagrams at the back of
this booklet.
Screw the thermostat back plate on to the back box
Step 3
Re-connect the thermostat ribbon cable and clip the two halves
together.
Step 4
Turn on the power to the thermostat and allow
the thermostat to stabilise for 1 hour before
calibrating.
6

7
How To Setup Your Thermostat
This thermostat has many options available to you. Once you have
set these settings you can leave them. They will be stored in the
thermostat memory and do not need to be adjusted.
You need to use the table opposite as a reference guide when
initially setting up the thermostat.
We strongly suggest you read the next few pages so that you fully
understand the features available and their intended use.
You should also understand that by enabling one feature, another
feature maybe made unavailable. This is because the feature is not
available in that mode.
Please read the features now, and then follow the setup routine
on the following pages.

8
Feature
Description Setting
01 Temperature Format 00=°C 01=°F (°C Default)
02 Switching Differential 01=1°C/F, 02=2°C/F, 03=3°C/F
(01 = Default)
03 Temperature Calibrate Enter Value
04 Frost Mode 00=Disabled 01=Enabled
(01 = Default)
05 Frost Protection Temp 07-17°C (12°C Default)
06 Output Delay Enter Value
00 - 30 minutes 00=Default
07 Comms # (PRT-EN) Enter number 01-32
08 Optimum Start (Preheat) 00=Disabled (Default)
01=01 hr 02=02 hr 03=03 hr
09 Rate of Change For information only,
10 Air Sensor Selection 00=Internal(Default) 01=Remote
11 Floor Sensor (Mode 1) 00=Disabled 01 Enabled
12
13
14
Floor Limit (Mode 1)
Not Used
Floor or Air&Floor Mode
(Mode 00) | (Mode 01)
20-45°C (28°C Default)
Floor Sensor Only = 00
Air & Floor Sensor = 01 Default

Understanding the Features
The installer should read the following features and then setup
the thermostat according to the features required.
Temperature Format: Select between°C or °F
Switching Differential: This is the number of degrees the heating
switches back on below the set temperature.
Temperature Calibrate: The thermostat is calibrated from the
factory, but you can use this function to calibrate if required.
Frost Mode: You can set whether the thermostat will maintain the
frost temperature even when the thermostat has been turned off
with the power button. As a default, this is enabled.
Frost Protection Temperature: This is used to set the required
frost temperature. The range is 07 - 17°C
Output Delay: To prevent rapid switching, an output delay can be
entered. This can be from 00 - 30 minutes.
9